propeller/pusher suggestion

I know the APC-SF props, I don't like them very much, they are ok for low power, but on higher power, they don't work very efficient. Start to "hum" and make bad noises.

I don't know the "EPP" props. A little heavier than GWS but should be ok.

- Oliver

Yes, GWS have them in pairs, that's what "everyone" is using here. Most use the normal 2 bladed props. At least on the light quads, below 1kg. Most of the quads I see are very light.

But not all sizes are available. And the smaller ones run better, can deliver more power.

(...)

Hmm, I just wanted to give you the sizes avaiolable, and now I noticed the shop I used to buy these (>1 year before) now only stocks "EPP". Can anyone inform me on these "EPP" blades? How do they look like? Maybe those are the GWS-Lookalikes I often see. Most of these look just like GWS but are a little heavier. I didn't notice a brand or name on them, though.

- Oliver

Again,

how do they look like? Are they the "gws-clones" I see very often on quads? That might explain it.

- Oliver

Thanks.

You, that clears it, I was refering to EPP Props. Clones of GWS Props but a little stiffer and more heavy.

- Oliver

I'll give it a shot (correct me if I'm wrong)

fast and aile: short Length close the the same as the Pitch agle, and an insanely high rpms (exa 7x7").
smooth and soft: Longer length, lesser than half the Pitch/length (exa 10x3.4")

Effects of different forces, on the same motor (you have to choose the motor/prop together).

Length: the longer the blade, the harder the motor has to work to get the the blade swinging. The longer the blade, the less pitch is needed to produce the same amount of trust (as to a shorter blade, higher pitch). A long blade can easily start to make noise, as it  goes super sonic at the tip of the blade at the same Rpms as a shorter one (think of a whip cracking continuously)

Pitch: Trust (static, dynamic)
LOW pitch/long blade; high static trust, good acceleration but no speed. Gives Punch/quick force reactions)
High pitch/short blade; fast speed but no acceleration.

Weight: You just dont want that. - makes the centrifugal forces act wildly, like a Gyro (hard to change flight direction)

It is far from easy to understand, but read this thread on the subject  How to choose an electric power system under Prop selection

-Troels